WANG Hong-wei, ZHI Xiao-qi
(National Defense Key Laboratory of Underground Damage Technology, North University of China, Taiyuan 030051, China)
Abstract： In order to study the relationship between charge size and thermal initiation critical temperature of explosive in defined conditions, cook-off test about JH explosive was carried out at a heating rate of 1 ℃/min using self-designed cook-off experiment setup based on thermostatic control technology. Numerical simulation was conducted to study the effects of different charge sizes on thermal initiation critical temperature of explosives with FLUENT software. Experiment results show that there is a thermal initiation critical temperature in cook-off bomb. Simulation results show that when the ratio of the length to diameter of explosives grains is a fixed value, the thermal initiation critical temperature of explosives decreases with the increase of the diameter of explosives grains. When the grains diameter of explosives increase up to a certain value, the influence of charge size on thermal initiation critical temperature tends to be weakened. Charge size has no influence on the ignition point of explosives. The ignition point is always in the center of the grain.
Key words： heating rate; thermal initiation thermostatic critical temperature; slow cook-off
CLD number： TJ55Document code： A
Article ID： 1674-8042（2015）03-0234-06 doi： 10.3969/j.issn.1674-8042.2015.03.006
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装药尺寸对限定条件下炸药热起爆临界温度的影响
王洪伟， 智小琦
（中北大学 地下目标毁伤技术国防重点实验室， 山西 太原 030051）
摘要:为研究装药尺寸与限定条件下炸药热起爆临界温度之间的关系， 利用自行设计的烤燃试验装置， 以RDX为主的JH炸药为试验材料， 在1 ℃/min的升温速率下， 采用恒温控制技术进行了不同温度下的烤燃试验。 利用FLUENT软件对不同装药尺寸下炸药的热起爆恒温临界温度进行了数值计算， 研究了装药尺寸对炸药热起爆恒温临界温度的影响。 试验结果表明， 烤燃弹存在一个热起起爆恒温临界温度。 仿真结果表明：当药柱的长径比相同时， 随着药柱尺寸的增加， 炸药的热起爆恒温临界温度逐步降低。 当药柱尺寸增大到一定值时， 装药尺寸对烤燃弹的热起爆恒温临界温度的影响将减弱。 装药尺寸对点火点的位置无影响， 均为中心点火。
关键词:升温速率； 热起爆恒温临界温度； 慢速烤燃
引用格式: WANG Hong-wei, ZHI Xiao-qi. Effects of charge size on explosives thermal initiation critical temperature under constrained conditions. Journal of Measurement Science and Instrumentation, 2015, 6(3): 234-239. ［doi: 10.3969／j.issn.1674-8042.2015.03.006］
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